Firebase错误：ReferenceError：未定义请求

Question

我的数据库中有这个：

当我尝试在Firebase云功能上查询时：

databaseRef.child("users-locale/world").orderByKey().limitToFirst(10).once("value", (snapshot) => {
      // do something
    });

我收到以下错误：

ReferenceError: request is not defined
    at databaseRef.child.orderByKey.startAt.limitToFirst.once (/user_code/index.js:48:81)
    at c (/user_code/node_modules/firebase-admin/lib/database/database.js:207:58)
    at /user_code/node_modules/firebase-admin/lib/database/database.js:185:831
    at tc (/user_code/node_modules/firebase-admin/lib/database/database.js:77:165)
    at le (/user_code/node_modules/firebase-admin/lib/database/database.js:112:215)
    at me (/user_code/node_modules/firebase-admin/lib/database/database.js:111:632)
    at dh.h.Eb (/user_code/node_modules/firebase-admin/lib/database/database.js:241:287)
    at kh.h.ud (/user_code/node_modules/firebase-admin/lib/database/database.js:228:251)
    at hg.ud (/user_code/node_modules/firebase-admin/lib/database/database.js:175:364)
    at Pf.Xf (/user_code/node_modules/firebase-admin/lib/database/database.js:173:281)